SpringBoot集成MyBatis

Posted 2022-08-28 chuanqi1995

Druid的优点

 DRUID是阿里巴巴开源平台上一个数据库连接池实现 是Java语言中最好的数据库连接池。它结合了C3P0、DBCP、PROXOOL等DB池的优点，同时加入了日志监控，可以很好的监控DB池连接和SQL的执行情况，可以说是针对监控而生的DB连接池(据说是目前最好的连接池,不知道速度有没有BoneCP快)。Druid能够提供强大的监控和扩展功能

 

https://www.cnblogs.com/wuyun-blog/p/5679073.html

1. 集成 Druid:

创建项目:

 

 

Starter POM(首先导入druid)

<dependency>

    <groupId>com.alibaba</groupId>

    <artifactId>druid-spring-boot-starter</artifactId>

    <version>1.1.6</version>

</dependency>

application.yml(直接复制修改即可)

spring:

  datasource:

    druid:

      url: jdbc:mysql://ip:port/dbname?useUnicode=true&characterEncoding=utf-8&useSSL=false

      username: root

      password: 123456

      initial-size: 1

      min-idle: 1

      max-active: 20

      test-on-borrow: true

      driver-class-name: com.mysql.jdbc.Driver

 

 

 

 

 

 

 

 

 

 

2. 集成 tk.mybatis

我们使用 tk.mybatis 简化 mybatis 开发，所以我们在 pom 中仅添加 tk.mybatis 的 starter pom

Starter POM

<dependency>

    <groupId>tk.mybatis</groupId>

    <artifactId>mapper-spring-boot-starter</artifactId>

    <version>1.1.5</version>

</dependency>

<dependency>

    <groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<version>5.1.46</version>

</dependency>

application.yml(在配置文件中添加mybatis的配置)

mybatis:

 type-aliases-package: com.suchuanqi.spring.boot.mybatis.domain   

mapper-locations: classpath:mapper/*.xml   

创建 MyMapper 通用接口

package com.suchuanqi.spring.boot.utils;

import tk.mybatis.mapper.common.Mapper;

import tk.mybatis.mapper.common.MySqlMapper;

/**

 * 自己的 Mapper

 * 特别注意，该接口不能被扫描到，否则会出错所以他不能够和启动springboot的那个类在 同一个包下或者是子包

 * <p>Title: MyMapper</p>

 * <p>Description: </p>

*/

public interface MyMapper<T> extends Mapper<T>, MySqlMapper<T> 

 

 

 

3集成 PageHelper

我们使用 PageHelper 做数据库分页插件

Starter POM

<dependency>

    <groupId>com.github.pagehelper</groupId>

    <artifactId>pagehelper-spring-boot-starter</artifactId>

    <version>1.2.3</version>

</dependency>

 

 

 

4. MyBatis Maven Plugin 自动生成代码

我们使用 MyBatis 的 Maven 插件来生成数据库访问代码

POM

<build>

    <plugins>

        <plugin>

            <groupId>org.mybatis.generator</groupId>

            <artifactId>mybatis-generator-maven-plugin</artifactId>

            <version>1.3.6</version>

            <configuration>

                <configurationFile>$basedir/src/main/resources/generator/generatorConfig.xml</configurationFile>

                <overwrite>true</overwrite>

                <verbose>true</verbose>

            </configuration>

            <dependencies>

                <dependency>

                    <groupId>mysql</groupId>

                    <artifactId>mysql-connector-java</artifactId>

                    <version>$mysql.version</version>

                </dependency>

                <dependency>

                    <groupId>tk.mybatis</groupId>

                    <artifactId>mapper</artifactId>

                    <version>3.4.4</version>

                </dependency>

            </dependencies>

        </plugin>

    </plugins>

</build>

自动生成配置

在 src/main/resources/generator/ 目录下创建 generatorConfig.xml 配置文件：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE generatorConfiguration

        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"

        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">



<generatorConfiguration>

    <properties resource="jdbc.properties"/>



    <context id="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">

        <property name="beginningDelimiter" value="`"/>

        <property name="endingDelimiter" value="`"/>



        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">

            <property name="mappers" value="com.suchuanqi.spring.boot.utils.MyMapper"/>

        </plugin>



        <jdbcConnection

                driverClass="$jdbc.driverClass"

                connectionURL="$jdbc.connectionURL"

                userId="$jdbc.username"

                password="$jdbc.password">

        </jdbcConnection>



        <javaModelGenerator targetPackage="com.suchuanqi.spring.boot.mybatis.domain" targetProject="src/main/java"/>



        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"/>



        <javaClientGenerator

                targetPackage="com.suchuanqi.spring.boot.mybatis.mapper"

                targetProject="src/main/java"

                type="XMLMAPPER"/>



        <table tableName="%">

            <!-- mysql 配置 -->

            <generatedKey column="id" sqlStatement="Mysql" identity="true"/>

        </table>

    </context>

</generatorConfiguration>

数据源配置

在 src/main/resources 目录下创建 jdbc.properties 数据源配置：

jdbc.driverClass=com.mysql.jdbc.Driver

jdbc.connectionURL=jdbc:mysql://ip:port/dbname?useUnicode=true&characterEncoding=utf-8&useSSL=false

jdbc.username=root

jdbc.password=123456

生成代码

mvn mybatis-generator:generate

 

 

进行代码测试

在test的包下进行测试:

 

注意上图可能会报错是因为我们要在springboot启动的入口哪里要添加一个扫描器进行扫描的注解,如下所所示: